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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd829a0721a46574b6c0292f49bd4b3e5375ccbc8f54c3a8646dfb0ae27856fde' 
  AND token = 'nu4bwCX60UcEMX2WRBMB7Lsdx7GZ6Ubnds6+pjzrj+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}